如何用erlang解析配置文件? [英] How to parse config file with erlang?
问题描述
这是我需要加载的YAML样式文件,我不在意配置文件的样式
a:
a1:
a2:1
a3:2
b:
b1:
b2:3
b3:4
如果您将配置数据存储为Erlang条款,则可以使用内置的文件:咨询/ 1 功能来解析它。
你的数据结构取决于你。例如,您可以使用proplists:
{a,[{a1,[{a2,1},{a3,2 }]}]}。
{b,[{b1,[{b2,3},{b3,4}]}]}。
或键键值作为原子列表的键值元组:
{[a,a1,a2],1}。
{[a,a1,a3],2}。
{[b,b1,b2],3}。
{[b,b1,b4],4}。
或使用键作为字符串/ charlists:
{a.a1.a2,1}。
{a.a1.a3,2}。
{b.b1.b2,3}。
{b.b1.b4,4}。
或用键作为原子:
{a.a1.a2,1}。
{a.a1.a3,2}。
{b.b1.b2,3}。
{b.b1.b4,4}。
等等。这取决于您的数据和您想要访问的数据。
i am developing one program with erlang, which need to read config file when starting, then load the config data to database. originally, using Ruby or C i can load YAML file or conf file. I want to know, in erlang's world, is there any good way to load config file? thanks!
This is the YAML-Style file I need to load, and i do not care the style of the config file
a:
a1:
a2: 1
a3: 2
b:
b1:
b2: 3
b3: 4
If you store the config data as Erlang terms you can use the built-in file:consult/1 function to parse it.
How you structure your data is up to you. For example, you could use proplists:
{a, [{a1, [{a2, 1}, {a3, 2}]}]}.
{b, [{b1, [{b2, 3}, {b3, 4}]}]}.
Or key-value tuples with keys as lists of atoms:
{[a, a1, a2], 1}.
{[a, a1, a3], 2}.
{[b, b1, b2], 3}.
{[b, b1, b4], 4}.
Or with keys as strings/charlists:
{"a.a1.a2", 1}.
{"a.a1.a3", 2}.
{"b.b1.b2", 3}.
{"b.b1.b4", 4}.
Or with keys as atoms:
{a.a1.a2, 1}.
{a.a1.a3, 2}.
{b.b1.b2, 3}.
{b.b1.b4, 4}.
And so on. It depends on your data and how you want to access it.
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